OPERATING INSTRUCTIONS AND SPECIFICATIONS
NI 9229/9239
4-Channel, 60/ 10 V, 24-Bit Simultaneous,
Channel-to-Channel Isolated Analog Input Modules
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Safety Guidelines
Operate the NI 9229/9239 only as described in these operating
instructions.
Hot Surface This icon denotes that the component may be
hot. Touching this component may result in bodily injury.
Safety Guidelines for Hazardous Voltages
If hazardous voltages are connected to the module, take the
following precautions. A hazardous voltage is a voltage greater
than 42.4 Vpk or 60 VDC to earth ground.
Caution Ensure that hazardous voltage wiring is
performed only by qualified personnel adhering to local
electrical standards.
Caution Do not mix hazardous voltage circuits and
human-accessible circuits on the same module.
Caution Make sure that devices and circuits connected to
the module are properly insulated from human contact.
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Caution When module terminals are hazardous voltage
LIVE (>42.4Vpk/60 VDC), you must ensure that devices
and circuits connected to the module are properly
insulated from human contact. You must use the NI 9971
connector backshell kit to ensure that the terminals are
not accessible.
Figure 1 shows the NI 9971 connector backshell.
Figure 1. NI 9971 Connector Backshell
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Safety Guidelines for Hazardous Locations
The NI 9229/9239 is suitable for use in Class I, Division 2,
Groups A, B, C, D, T4 hazardous locations; Class I, Zone 2,
AEx nA IIC T4, and Ex nA IIC T4 hazardous locations; and
nonhazardous locations only. Follow these guidelines if you are
installing the NI 9229/9239 in a potentially explosive environment.
Not following these guidelines may result in serious injury or
death.
Caution Do not disconnect I/O-side wires or connectors
unless power has been switched off or the area is known
to be nonhazardous.
Caution Do not remove modules unless power has been
switched off or the area is known to be nonhazardous.
Caution Substitution of components may impair
suitability for Class I, Division 2.
Caution For Zone 2 applications, install the system
in an enclosure rated to at least IP 54 as defined by
IEC 60529 and EN 60529.
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Caution For Zone 2 applications, install a protection
device between the input signal and the NI 9229/9239
input terminal. The device must prevent the input
channel-to-COM voltage from exceeding 85 V if there is
a transient overvoltage condition.
Caution For Zone 2 applications, connected signals must
be within the following limit:
Capacitance..........................0.01 μF max
Special Conditions for Hazardous Locations Use in Europe
This equipment has been evaluated as Ex nA IIC T4 equipment
under DEMKO Certificate No. 07 ATEX 0626664X. Each module
is marked
II 3G and is suitable for use in Zone 2 hazardous
locations. If you are using the NI 9229/9239 in Gas
Group IIC hazardous locations or in ambient temperatures of
–40 °C ≤ Ta ≤ 70 °C, you must use the device in an NI chassis that
has been evaluated as EEx nC IIC T4, Ex nA IIC T4, or
Ex nL IIC T4 equipment.
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Special Conditions for Marine Applications
Some modules are Lloyd’s Register (LR) Type Approved for
marine applications. To verify Lloyd’s Register certification, go to
ni.com/certification and search for the LR certificate, or
look for the Lloyd’s Register mark on the module.
Caution To meet radio frequency emission requirements
for marine applications, use shielded cables and install
the system in a metal enclosure. Suppression ferrites
must be installed on power supply inputs near power
entries to modules and controllers. Power supply and
module cables must be separated on opposite sides of the
enclosure and must enter and exit through opposing
enclosure walls.
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Connecting the NI 9229/9239
The NI 9229/9239 provides connections for four simultaneously
sampled, isolated analog input channels.
AI0+
AI0–
0
1
AI1+
AI1–
0
1
AI2+
AI2–
0
1
AI3+
AI3–
0
1
Figure 2. NI 9229/9239 Terminal Assignments
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The NI 9229/9239 has four 2-terminal detachable screw-terminal
connectors.
Note You must use 2-wire ferrules to create a secure
connection when connecting more than one wire to a
single terminal on the NI 9229/9239.
You can connect ground-referenced or floating signal sources to
the NI 9229/9239. Connect the positive signal of the signal source
to the AI+ terminal or connector, and connect the negative signal
of the signal source to the AI– terminal or connector. If you make
a ground-referenced connection between the signal source and the
NI 9229/9239, make sure the voltage on the AI+ and AI–
connections are in the channel-to-earth safety voltage range to
ensure proper operation of the NI 9229/9239. Refer to the
Specifications section for more information about operating
voltages and overvoltage protection. Refer to Figures 3 and 4 for
illustrations of how to connect grounded and floating signal
sources to the NI 9229/9239.
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Signal
Source
AI+
AI–
+
–
NI 9229/9239
Figure 3. Connecting a Grounded Signal Source to the NI 9229/9239
Signal
Source
AI+
+
–
AI–
NI 9229/9239
Figure 4. Connecting a Floating Signal Source to the NI 9229/9239
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The NI 9229/9239 analog input channels are floating with respect
to earth ground and each other. The incoming analog signal on each
channel is conditioned, buffered, and then sampled by a 24-bit
Delta-Sigma ADC.
Each channel provides an independent signal path and ADC,
enabling you to sample all four channels simultaneously. Refer to
Figure 5 for an illustration of the circuitry for one channel.
AI+
Overvoltage
ADC
Protection
AI–
Amplifier Prefilter
NI 9229/9239
Figure 5. Input Circuitry for One Channel of the NI 9229/9239
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Wiring for High-Vibration Applications
If an application is subject to high vibration, National Instruments
recommends that you either use ferrules to terminate wires to the
detachable screw-terminal connector or use the NI 9971 backshell
kit to protect the connections. Refer to Figure 6 for an illustration
of using ferrules. Refer to Figure 1 for an illustration of the
NI 9971 connector backshell.
Figure 6. 2-Terminal Detachable Screw-Terminal Connector with Ferrule
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Understanding NI 9229/9239 Filtering
The NI 9229/9239 uses a combination of analog and digital
filtering to provide an accurate representation of in-band signals
while rejecting out-of-band signals. The filters discriminate
between signals based on the frequency range, or bandwidth, of the
signal. The three important bandwidths to consider are the
passband, the stopband, and the alias-free bandwidth.
The NI 9229/9239 represents signals within the passband, as
quantified primarily by passband flatness and phase nonlinearity.
All signals that appear in the alias-free bandwidth are either
unaliased signals or signals that have been filtered by at least the
amount of the stopband rejection.
Passband
The signals within the passband have frequency-dependent gain or
attenuation. The small amount of variation in gain with respect to
frequency is called the passband flatness. The digital filters of the
NI 9229/9239 adjust the frequency range of the passband to match
the data rate. Therefore, the amount of gain or attenuation at a
given frequency depends on the data rate. Figure 7 shows typical
passband flatness for the NI 9229/9239.
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0.025
0.000
–0.025
–0.050
0
0.1
0.2
0.3
0.4
0.5
Frequency/Data Rate
Figure 7. Typical Passband Flatness for the NI 9229/9239
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Stopband
The filter significantly attenuates all signals above the stopband
frequency. The primary goal of the filter is to prevent aliasing.
Therefore, the stopband frequency scales precisely with the data
rate. The stopband rejection is the minimum amount of attenuation
applied by the filter to all signals with frequencies within the
stopband.
Alias-Free Bandwidth
Any signal that appears in the alias-free bandwidth of the
NI 9229/9239 is not an aliased artifact of signals at a higher
frequency. The alias-free bandwidth is defined by the ability of the
filter to reject frequencies above the stopband frequency and equals
the data rate minus the stopband frequency.
Understanding NI 9229/9239 Data Rates
The frequency of a master timebase (fM) controls the data rate (fs)
of the NI 9229/9239. The NI 9229/9239 includes an internal master
timebase with a frequency of 12.8 MHz, but the module also can
accept an external master timebase or export its own master
timebase. To synchronize the data rate of an NI 9229/9239 with
other modules that use master timebases to control sampling, all of
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the modules must share a single master timebase source. Refer to
the software help for information about configuring the master
timebase source for the NI 9229/9239. Visit ni.com/info and
enter cseriesdoc for information about C Series documentation.
The following equation provides the available data rates of the
NI 9229/9239:
f
÷ 256
n
--M------------------
fs =
where n is any integer from 1 to 31.
However, the data rate must remain within the appropriate data rate
range. Refer to the Specifications section for more information
about the data rate range. When using the internal master timebase
of 12.8 MHz, the result is data rates of 50 kS/s, 25 kS/s, 16.67 kS/s,
and so on down to 1.613 kS/s, depending on the value of n. When
using an external timebase with a frequency other than 12.8 MHz,
the NI 9229/9239 has a different set of data rates.
Note The cRIO-9151 R Series Expansion chassis does
not support sharing timebases between modules.
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Sleep Mode
This module supports a low-power sleep mode. Support for sleep
mode at the system level depends on the chassis that the module is
plugged into. Refer to the chassis manual for information about
support for sleep mode. If the chassis supports sleep mode, refer to
the software help for information about enabling sleep mode. Visit
ni.com/info and enter cseriesdoc for information about
C Series documentation.
Typically, when a system is in sleep mode, you cannot
communicate with the modules. In sleep mode, the system
consumes minimal power and may dissipate less heat than it does
in normal mode. Refer to the Specifications section for more
information about power consumption and thermal dissipation.
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Specifications
The following specifications are typical for the range –40 to 70 °C
unless otherwise noted. All voltages are relative to the AI– signal
on each channel unless otherwise noted. The specifications are the
same for the NI 9229 and the NI 9239 unless otherwise noted.
Input Characteristics
Number of channels..........................4 analog input channels
ADC resolution.................................24 bits
Type of ADC.....................................Delta-Sigma (with analog
prefiltering)
Sampling mode.................................Simultaneous
Internal master timebase (fM)
Frequency...................................12.8 MHz
Accuracy..................................... 100 ppm max
Data rate range (fs) using internal master timebase
Minimum....................................1.613 kS/s
Maximum ...................................50 kS/s
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Data rate range (fs) using external master timebase
Minimum....................................390.625 S/s
Maximum ...................................51.2 kS/s
f
÷ 256
n
--M------------------
1
Data rates (fs)...................................
, n = 1, 2, …, 31
Input voltage ranges (AI+ to AI–)2
Module
NI 9229
NI 9239
Nominal (V)
Typical (V)
62.64
Minimum (V)
61.5
60
10
10.52
10.3
Overvoltage protection ..................... 100 V
Input coupling...................................DC
Input impedance (AI+ to AI–)..........1 MΩ
1
The data rate must remain within the appropriate data rate range. Refer to the
Understanding NI 9229/9239 Data Rates section for more information.
2
Refer to the Safety Guidelines section for more information about safe operating
voltages.
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Accuracy, NI 9229
Percent of
Range*
(Offset Error)
Percent of
Reading
(Gain Error)
Measurement Conditions
Calibrated max (–40 to 70 °C)
Calibrated typ (25 °C, 5 °C)
Uncalibrated max (–40 to 70 °C)
Uncalibrated typ (25 °C, 5 °C)
* Range equals 62.64 V
0.13%
0.03%
1.2%
0.05%
0.008%
0.55%
0.11%
0.3%
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Accuracy, NI 9239
Percent of
Range*
(Offset Error)
Percent of
Reading
(Gain Error)
Measurement Conditions
Calibrated max (–40 to 70 °C)
Calibrated typ (25 °C, 5 °C)
Uncalibrated max (–40 to 70 °C)
Uncalibrated typ (25 °C, 5 °C)
* Range equals 10.52 V
0.13%
0.03%
1.4%
0.06%
0.008%
0.70%
0.11%
0.3%
Input noise
NI 9229.......................................320 μVrms
NI 9239.......................................70 μVrms
Stability
Gain drift .................................... 5 ppm/°C
Offset drift
NI 9229 ................................ 150 μV/°C
NI 9239 ................................ 26 μV/°C
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Post calibration gain match
(ch-to-ch, 20 kHz).............................0.22 dB max
Crosstalk (1 kHz)..............................–130 dB
Phase mismatch (ch-to-ch)
NI 9229.......................................0.045°/kHz max
NI 9239.......................................0.075°/kHz max
Phase mismatch (module-to-module, max)
NI 9229.......................................0.045°/kHz + 360°· fin/fM
NI 9239.......................................0.075°/kHz + 360°· fin/fM
Phase nonlinearity (fs = 50 kS/s).......0.11° max
Input delay
NI 9229.......................................38.4/fs + 2.6 μs
NI 9239.......................................38.4/fs + 3 μs
Passband
Frequency...................................0.453 · fs
Flatness (fs = 50 kS/s)................. 100 mdB max
Stopband
Frequency...................................0.547 · fs
Rejection.....................................100 dB
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Alias-free bandwidth ........................0.453 · fs
–3 dB prefilter bandwidth
(fs = 50 kS/s)......................................24.56 kHz
CMRR (fin = 60 Hz)
NI 9229.......................................116 dB
NI 9239.......................................126 dB
SFDR (1 kHz, –60 dBFS).................–128 dBFS
Total Harmonic Distortion (THD)
1 kHz, –1 dBFS ..........................–99 dB
1 kHz, –20 dBFS ........................–105 dB
MTBF ...............................................662,484 hours at 25 °C;
Bellcore Issue 2, Method 1,
Case 3, Limited Part Stress
Method
Note Contact NI for Bellcore MTBF specifications
at other temperatures or for MIL-HDBK-217F
specifications.
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Power Requirements
Power consumption from chassis
Active mode ...............................740 mW max
Sleep mode .................................25 μW max
Thermal dissipation (at 70 °C)
Active mode ...............................760 mW max
Sleep mode .................................16 mW max
Physical Characteristics
If you need to clean the module, wipe it with a dry towel.
Screw-terminal wiring ......................16 to 28 AWG copper
conductor wire with 7 mm
(0.28 in.) of insulation
stripped from the end
Torque for screw terminals ...............0.22 to 0.25 N · m
(1.95 to 2.21 lb · in.)
Ferrules .............................................0.25 mm2 to 0.5 mm2
Weight...............................................147 g (5.2 oz)
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Safety
Safety Voltages
Connect only voltages that are within the following limits.
Channel-to-earth ground isolation
Continuous .................................250 Vrms
,
Measurement Category II
Withstand....................................2,300 Vrms, verified by a 5 s
dielectric withstand test
Channel-to-channel isolation
Continuous .................................250 Vrms
,
Measurement Category II
Withstand....................................1,390 Vrms, verified by a 5 s
dielectric withstand test
Zone 2 hazardous locations applications in Europe
Maximum voltage
(channel-to-earth ground
and channel-to-channel) .............60 VDC,
Measurement Category I
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Measurement Category I is for measurements performed on
circuits not directly connected to the electrical distribution system
referred to as MAINS voltage. MAINS is a hazardous live
electrical supply system that powers equipment. This category is
for measurements of voltages from specially protected secondary
circuits. Such voltage measurements include signal levels, special
equipment, limited-energy parts of equipment, circuits powered by
regulated low-voltage sources, and electronics.
Caution Do not connect to signals or use for
measurements within Measurement Categories II,
III, or IV.
Measurement Category II is for measurements performed on
circuits directly connected to the electrical distribution system.
This category refers to local-level electrical distribution, such as
that provided by a standard wall outlet, for example, 115 V for U.S.
or 230 V for Europe.
Caution Do not connect to signals or use for
measurements within Measurement Categories III or IV.
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Safety Standards
This product is designed to meet the requirements of the following
standards of safety for electrical equipment for measurement,
control, and laboratory use:
•
•
IEC 61010-1, EN 61010-1
UL 61010-1, CSA 61010-1
Note For UL and other safety certifications, refer to the
product label or visit ni.com/certification, search
for the module number or product line, and click the
appropriate link in the Certification column.
Hazardous Locations
U.S. (UL) ..........................................Class I, Division 2,
Groups A, B, C, D, T4;
Class I, Zone 2,
AEx nA IIC T4
Canada (C-UL) .................................Class I, Division 2,
Groups A, B, C, D, T4;
Class I, Zone 2,
Ex nA IIC T4
Europe (DEMKO).............................Ex nA IIC T4
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Environmental
National Instruments C Series modules are intended for indoor use
only but may be used outdoors if installed in a suitable enclosure.
Refer to the manual for the chassis you are using for more
information about meeting these specifications.
Operating temperature
(IEC 60068-2-1, IEC 60068-2-2) .....–40 to 70 °C
Storage temperature
(IEC 60068-2-1, IEC 60068-2-2) .....–40 to 85 °C
Ingress protection..............................IP 40
Operating humidity
(IEC 60068-2-56)..............................10 to 90% RH,
noncondensing
Storage humidity
(IEC 60068-2-56)..............................5 to 95% RH,
noncondensing
Maximum altitude.............................2,000 m
Pollution Degree (IEC 60664)..........2
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Shock and Vibration
To meet these specifications, you must panel mount the system and
either affix ferrules to the ends of the terminal wires or use the
NI 9971 backshell kit to protect the connections.
Operating vibration
Random (IEC 60068-2-64).........5 grms, 10 to 500 Hz
Sinusoidal (IEC 60068-2-6) .......5 g, 10 to 500 Hz
Operating shock
(IEC 60068-2-27)..............................30 g, 11 ms half sine,
50 g, 3 ms half sine,
18 shocks at 6 orientations
Electromagnetic Compatibility
This product is designed to meet the requirements of the following
standards of EMC for electrical equipment for measurement,
control, and laboratory use:
•
•
•
EN 61326 EMC requirements; Industrial Immunity
EN 55011 Emissions; Group 1, Class A
CE, C-Tick, ICES, and FCC Part 15 Emissions; Class A
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Note For EMC compliance, operate this device with
shielded cabling.
CE Compliance
This product meets the essential requirements of applicable
European directives, as amended for CE marking, as follows:
•
•
2006/95/EC; Low-Voltage Directive (safety)
2004/108/EC; Electromagnetic Compatibility Directive
(EMC)
Note Refer to the Declaration of Conformity (DoC) for
this product for any additional regulatory compliance
information. To obtain the DoC for this product, visit
ni.com/certification, search for the module number
or product line, and click the appropriate link in the
Certification column.
Environmental Management
National Instruments is committed to designing and manufacturing
products in an environmentally responsible manner. NI recognizes
that eliminating certain hazardous substances from our products is
beneficial not only to the environment but also to NI customers.
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For additional environmental information, refer to the NI and the
Environment Web page at ni.com/environment. This page
contains the environmental regulations and directives with which
NI complies, as well as other environmental information not
included in this document.
Waste Electrical and Electronic Equipment (WEEE)
EU Customers At the end of their life cycle, all products
must be sent to a WEEE recycling center. For more
information about WEEE recycling centers and National
Instruments WEEE initiatives, visit ni.com/
environment/weee.htm.
˅
RoHS
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Ёᅶ᠋
National Instruments
DŽ݇Ѣ
(RoHS)
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ড়㾘ᗻֵᙃˈ䇋ⱏᔩ
RoHS
National Instruments
ni.com/environment/rohs_chinaDŽ
about China RoHS compliance, go to
environment/rohs_china
(For information
ni.com/
.)
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Calibration
You can obtain the calibration certificate and information about
calibration services for the NI 9229/9239 at ni.com/
calibration.
Calibration interval ...........................1 year
Where to Go for Support
The National Instruments Web site is your complete resource for
technical support. At ni.com/support you have access to
everything from troubleshooting and application development
self-help resources to email and phone assistance from
NI Application Engineers.
National Instruments corporate headquarters is located at
11500 North Mopac Expressway, Austin, Texas, 78759-3504.
National Instruments also has offices located around the world to
help address your support needs. For telephone support in the
United States, create your service request at ni.com/support
and follow the calling instructions or dial 512 795 8248. For
telephone support outside the United States, contact your local
branch office:
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Australia 1800 300 800, Austria 43 662 457990-0,
Belgium 32 (0) 2 757 0020, Brazil 55 11 3262 3599,
Canada 800 433 3488, China 86 21 5050 9800,
Czech Republic 420 224 235 774, Denmark 45 45 76 26 00,
Finland 358 (0) 9 725 72511, France 01 57 66 24 24,
Germany 49 89 7413130, India 91 80 41190000,
Israel 972 3 6393737, Italy 39 02 41309277, Japan 0120-527196,
Korea 82 02 3451 3400, Lebanon 961 (0) 1 33 28 28,
Malaysia 1800 887710, Mexico 01 800 010 0793,
Netherlands 31 (0) 348 433 466, New Zealand 0800 553 322,
Norway 47 (0) 66 90 76 60, Poland 48 22 3390150,
Portugal 351 210 311 210, Russia 7 495 783 6851,
Singapore 1800 226 5886, Slovenia 386 3 425 42 00,
South Africa 27 0 11 805 8197, Spain 34 91 640 0085,
Sweden 46 (0) 8 587 895 00, Switzerland 41 56 2005151,
Taiwan 886 02 2377 2222, Thailand 662 278 6777,
Turkey 90 212 279 3031, United Kingdom 44 (0) 1635 523545
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Terms of Use section on ni.com/legal for more information about National Instruments trademarks. Other
product and company names mentioned herein are trademarks or trade names of their respective companies.
For patents covering National Instruments products, refer to the appropriate location: Help»Patents in your software,
the patents.txt file on your media, or ni.com/patents.
© 2007–2008 National Instruments Corp. All rights reserved.
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